linux-kernel - [RFC PATCH 0/2] introduce budgt control in readahead

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240509023937.1090421-1-zhaoyang.huang@unisoc.com>
Date: Thu, 9 May 2024 10:39:35 +0800
From: "zhaoyang.huang" <zhaoyang.huang@...soc.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox
	<willy@...radead.org>, Jens Axboe <axboe@...nel.dk>,
        Tejun Heo
	<tj@...nel.org>, Josef Bacik <josef@...icpanda.com>,
        Baolin Wang
	<baolin.wang@...ux.alibaba.com>, <linux-mm@...ck.org>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <cgroups@...r.kernel.org>, Zhaoyang Huang <huangzhaoyang@...il.com>,
        <steve.kang@...soc.com>
Subject: [RFC PATCH 0/2] introduce budgt control in readahead

From: Zhaoyang Huang <zhaoyang.huang@...soc.com>

Over-limit bw value is observed during fio test in the throttling group
which caused by over-sized bio as there is no control on ra->size during
readahead. This series patches would like to introduce the helper
function to provide the bytes limit and apply it on readahead.

Please find below for the fio test result on v6.6 which presents 2%-10%
improvement for BW and lat. Besides, we can also observed stable BW
instantaneous value during the test.

blkio.throttle.read_bps_device = 1MB/s
   before:  read: IOPS=223, BW=894KiB/s (915kB/s)(175MiB/200919msec)
   after :  read: IOPS=239, BW=960KiB/s (983kB/s)(153MiB/163105msec)

   before:  clat (usec): min=4, max=16795k, avg=4468.74, stdev=265746.14
            lat  (usec): min=6, max=16795k, avg=4470.57, stdev=265746.14
   after :  clat (usec): min=11, max=209193, avg=4105.22, stdev=27188.04
            lat  (usec): min=16, max=209197, avg=4120.03, stdev=27188.04


blkio.throttle.read_bps_device = 10MB/s
   before:  read: IOPS=2380, BW=9524KiB/s (9752kB/s)(1007MiB/108311msec)
   after :  read: IOPS=2438, BW=9754KiB/s (9989kB/s)(1680MiB/176405msec)

   before:  clat (usec): min=4, max=201817, avg=399.58, stdev=8268.85
            lat  (usec): min=6, max=201819, avg=402.10, stdev=8268.85
   after :  clat (usec): min=4, max=2494.6k, avg=412.72, stdev=25783.51
            lat  (usec): min=6, max=2494.6k, avg=414.48, stdev=25783.51

Zhaoyang Huang (2):
  block: introduce helper function to calculate bps budgt
  mm: introduce budgt control in readahead

 block/blk-throttle.c       | 44 ++++++++++++++++++++++++++++++++++++++
 include/linux/blk-cgroup.h | 10 +++++++++
 mm/readahead.c             | 33 ++++++++++++++++++++--------
 3 files changed, 78 insertions(+), 9 deletions(-)

-- 
2.25.1